Looper mechanism for sewing-machines.



No. 775,014. PATENTED NOV. 15, 190% L. ONDERDONK.

LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION FILE-D JAN. 9, 1397.

N0 MODEL. 2 SHEETS-*SHBET 1.

WITNESSES v IJW JV'TOR aka a. Mm

No. 775,014. I PATENTED NOV. 15, 1904. L. ONDERDONK.

' LOOPER MECHANISM FOR SEWING MAGHINES,.

APPLICATION FILED JAN. 9, 1397. y no MODEL. M da 2 san'rs-snn'r 2.

WITNESSES IJV'V' .N'T R.

Attorney UNITED STATES Patented. November 15, 1904.

PATENT OFFICE.

LANSING ONDERDONK, OF WINTHROP, MASSACHUSETTS, ASSIGNOR TO THE UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF- ILLINOIS.

LOOPER MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 775,014, dated'November 15, 1904. Application filed January 9, 1897. Serial No. 618,536. (No model.)

To all whom it may concern.-

Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at \Vinthrop, in the county of Suffolk, State of Masthe looper and to provide necessary adjust ments to vary the amount of throw thereof.

The invention consists in the matters here inafter described, and referred to in the appended claims. 9

In the accompanying drawings, which illustrate the invention, Figure 1 is a side elevation of so much of a sewing-machine as is necessary to a complete understanding of the invention, in which figure the centers of oscillation upon which the looper-support is arranged are in a perpendicular line with each other and with the line of movement of the needle, so that there is no sidewise movement of said looper. Fig. 2 is a similar view showing the looper at the other extreme of its movement. Fig. 3 is an end view of Fig. 1. Figs. 4 and 5 are top plan detail views of the crank-pin and yoke which support the loopersupporting post. v Fig. 6 is a view similar to Fig. 1, showing a modification in the construction of the looper-supporting post, the center-uponwhich the looper-supporting post swings being arranged in line with the needle, but the center of the point of connection of the crank-pin of said supporting-post being out of perpendicular alinement with said first center. Fig. 7 is another modification showing both said centers out of perpendicular alinement with each other and neither in line with the needle.

In the drawings, A represents a portion of the bed-plate of asewing-machine; A, an upright standard secured to the bed of the machine in which the forward end of the driving-shaft H is journaled. This driving-shaft .shown at 1, and held in position by means of the nut E The yoke E in the rotation of the shaft H is therefore permitted to turn in its bearing, the back of said yoke E, as shown at 6, shouldering against the collar B. Journaled in the arms of the yoke E is a short transverse shaft E, having a central opening 7, which embraces the lower portion of the upright supporting post or shaft D, upon the upper end of which the looper 8 is secured.

Passing through the upper portion of the bearing-post A is a screw-stud K, the forward end of which projects through said bearingpost A. Upon its outer end and held in position by the nut k is a yoke C, the shank of which forms a sleeve 9, journaled on the forward end of said stud K. Between the arms ofthis yoke C is fitted a block C through which said upright looper-supporting post or rod D passes. Through the looper-rod D and the block C passes a transverse pin. (Shown in dotted lines in Fig. 5.) This pin C forms the fulcrum upon which the looper-holder or carrying-post D rocks sidewise. The block C simply acts to fill in the space between the arms of the yoke and prevents any strain on the rod D at its weakest pointnamely, the point at which the pin C passes through it. The stud K, which will be seen is the fulcrum or pivot-point upon which the looper swings in its loop-taking and loop-leaving movement, while, as above stated, in case a sidewise movement is imparted to the looper the pin C is the fulcrum or pivot-point upon which it rocks. The yoke C, therefore, as a whole constitutes a universal support for the looper-carrying" post D, and the arrangement of the shaft H, collar B, and the yoke-shaped crank-pin E, with the part E, forms a universal driving device for the looper in the revolution of the shaft H. Consequently the collar B and the yoke E are always able to conform to the angle at which the looper-supporting post D may stand, the part E in the revolution of the shaft traveling up and down the post D the distance equal to the diameter of the circle traveled, said circle being represented by dotted lines, as shown in Fig. 3. In the form shown in Figs. 1, 2, and 3, in which the centers C and E are in a perpendicular line with each other, it will be noticed that there will be no sidewise movement of the looper. In the device shown in Fig. 6 the center C is in line with the needle, but the center E is off said line, and the lower part of the looper-supporting post D from the center 0' to the lower end is on an incline or bent, as shown in Fig. 6. By this arrangement a sidewise motion to the looper is given and equal motion on either side of the plane of the needle-line.

As a further and special arrangement in a machine of this character I provide means for adjusting the slant of the looper-si'lpporting rod to the corresponding relation of the centers one to the other. This adjustment can be effected by loosening up on the check-nut K and turning the screw-stud K in or out and by loosening up the screws 1 in the collar B and moving said collar to the right or left, according to the adjustment desired.

Referring now to the construction shown in Figs. 1, 2, and 3. and especially with reference to Fig. 3, it will be noticed that the crank-pin is at its highest point. The lines which I have marked 0 and m in Fig. 3 show the right-andleft or needle-loop-taking movement of the looper and the dotted circle a: z the circle traveled by the crank-pin. It will be noticed that one of the looper movements, either the forward or backward movement, is much quicker than the other, as will be seen by referring to the point 2 2 on the dotted circle in Fig. 3, this being only about one-fourth of a whole revolution of the driving arrangements. The looper thereforein one ofits two movements,or where there is a sidewise motion in two of its four movement to the looper, and were the shaft H an oscillating shaft with the connections and arrangements shown in Figs. 1, 2, and 8 all purposes, so far as the underthrow of the looper is concerned, would be practically carried out. The needle-avoiding movement in the constructions here shown comes from the center upon which the looper-post swings namely, Cbeing' without the plane of rotation of the center of the connection between the looper-post D and the yoke E.

Various minor modifications and changes in the construction of the various parts of the apparatus may be made without departing from the spirit of my invention.

Having thus described my invention, I desire to claim and secure by Letters Patent the following:

1. In a sewing-machine a universally-pivoted looper-supporting rod, a driving-shaft, a crank-pin journaled in the forward end of said driving-shaft, and embracing said looper-supporting rod, whereby in the movement of said shaft, the crank-pin turns on its bearing and slides up and down on the looper-supporting rod, substantially as described.

2. In a sewing-machine a universally-pivoted looper-supporting rod, a driving-shaft, a crank-pin journaled in said driving-shaft and having a yoke-shaped outer end, a transverse shaft supported between the arms of said yoke and having an opening through which the looper-supporting rod passes, whereby said yoke slides up and down on the looper-supporting rod, in the rotation of the crank-pin, substantially as described.

3. In a sewing-machine, a looper-support pivoted to have forward and backward movement, a driving-shaft, a collar on the forward end of said shaft, a crank-pin eccentrically journaled in said collar, said crank-pin having a sliding connection with the looper-support. whereby said crank-pin rotates on its bearing and reciprocates longitudinally of the loopersupport, substantially as described.

4. In a sewing-machine, a universally-pivoted looper-support, a driving-shaft, a collar on the forward end of said shaft, a crank-pin eccentrically journaled in said collar, said crank-pin being provided with a pivoted block or shaft having a sliding engagement with the looper-support, whereby said crank-pin rotates on its bearing and reciprocates longitudinally of the looper-support, substantially as described.

5. In a sewing-machine, a universally-pivoted looper-support, a driving-shaft, a collar on the forward end of said shaft, a crank-pin eccentrically journaled in said collar, said crank-pin being provided with a pivoted block or shaft having a sliding engagement with the looper-support, whereby said crank-pin rotates on its bearing and reciprocates longitudinally of the loopersupport, and means for adjusting said collar, substantially as described.

6. In a sewing-machine, a looper-supporting rod hung on a universal pivot carrying a looper at one end and being free at its opposite end, a driving-shaft, and a revolving cran kpin having a pivoted block embracing the looper supporting rod, substantially as described.

7. In a sewing-machine an actuating-shaft, a universally-pivoted looper-supporting rod, having its lower portion inclined relatively to the axis of the actuating-shaft, and a rotating crank-pin driven by the actuating-shaft and having a vertically-sliding engagement with said inclined portion of the looper; substantially as described.

8. In a sewing-machine, a driving-shaft, a looper-supporting rod, a pivoted yoke, to which the looper-supporting rod, is pivotally connected, and a rotating crank having a part through which the looper -supporting rod passes and which slides up and down thereupon; substantially as described.

9. In asewing-machine,in combination with an actuatingshaft,a rotary crank driven thereby, a looper-supporting rod to which that swung in the direction of its length and also bodily sidewise, substantially as described.

In testimony whereof I aifix my signature in presence of two witnesses.

LANSING ONDERDONK.

Witnesses:

CHAS. L. STURTEVANT, F. S. FAwcETT. 

